To manually test this, select the text and change the foreground color.

The resulting debug message should show the input color.

This is some text
Received beforeinput event with data: "rgb(255, 255, 255)"
Received input event with data: "rgb(255, 255, 255)"
Received beforeinput event with data: "rgb(100, 255, 0)"
Received input event with data: "rgb(100, 255, 0)"
Received beforeinput event with data: "rgb(0, 0, 0)"
Received input event with data: "rgb(0, 0, 0)"
Received beforeinput event with data: "rgb(255, 0, 0)"
Received input event with data: "rgb(255, 0, 0)"